DE102022129522A1 - Electrode winding for an energy storage cell, energy storage cell and method for producing - Google Patents

Abstract

The invention relates to an electrode coil for an energy storage cell, comprising: (i) a first electrode with a first current conductor, which has a first electrically conductive material that is impermeable to ions during operation of the energy storage cell; (ii) wherein the first current conductor has two opposite sides, each coated with a first active material in which ions, in particular lithium ions, can be stored; (iii) a second electrode with a second current conductor, which has a second electrically conductive material that is impermeable to ions during operation of the energy storage cell; (iv) wherein the second current conductor has two opposite sides, each coated with a second active material in which the ions can be stored; (v) a separator arranged between the first electrode and the second electrode, whereby the first electrode and the second electrode are electrically insulated from one another; (vi) wherein the first current conductor has a first region which is permeable to ions so that the ions can pass from one to the other of the two opposite sides of the first current conductor.

Description

The present invention relates to an electrode winding for an energy storage cell, an energy storage cell and a method, in particular a computer-implemented method, for producing an electrode winding. The present invention further relates to a battery module with such energy storage cells and a motor vehicle with such a battery module.

In the field of energy storage cells, especially battery cells, especially lithium-ion battery cells, cylindrical, prismatic and pouch-shaped battery cells are known. Battery cells for storing electrical energy play a central role in the field of so-called electromobility, both in vehicles with purely electric drives and in vehicles with hybrid drives. For example, a battery module for a 12V starter battery can have four battery cells, whereas a high-voltage storage device can have several battery modules. Cylindrical lithium-ion battery cells can have an electrode winding in which the electrodes including the separator are wound spirally around a winding core in the sequence separator-anode-separator-cathode.

The electrodes can contain a mixture of active material, binder and conductive additives. This mixture can be applied as a thin layer to both sides of a current collector. The coating can be applied to both sides with either an identical load (symmetrical coating) or a slightly different load (asymmetrical coating). It is necessary that the ratio of the capacity per area (in mAh/cm ² ) from anode to cathode (N/P ratio) is greater than 1 in order to prevent so-called "lithium plating". At the same time, the N/P ratio should not be too large in order to keep irreversible lithium losses due to so-called SEI (solid electrolyte interface) formation on the anode as low as possible.

Due to the spiral winding of the electrode coil, the outer electrode can deliver or absorb a larger capacity than the inner electrode opposite it due to the larger radius.

This leads to a deviation from a desired N/P ratio. For purely geometric reasons, the deviation from this N/P ratio is greatest in the innermost turns. To reduce the deviation in the innermost turns, the front and back of at least one electrode can be coated with slightly different loading (asymmetrical coating). However, from a process perspective, an asymmetrical coating is more complex to produce than a symmetrical coating because the loading on the front and back must be different and the two sides should always be clearly identifiable. This assignment is difficult to make, for example, by means of a visual inspection.

It is an object of the present invention to provide an electrode winding for an energy storage cell, an energy storage cell, a battery module, a motor vehicle and a method which is improved with regard to the above-mentioned problems.

This object is achieved by an electrode winding according to claim 1, an energy storage cell, a battery module with such energy storage cells, a motor vehicle with such a battery module and a method for producing an electrode winding.

A first aspect of the solution relates to an electrode coil for an energy storage cell, comprising: (i) a first electrode with a first current conductor, which has a first electrically conductive material that is impermeable to ions during operation of the energy storage cell; (ii) wherein the first current conductor has two opposite sides, each coated with a first active material in which ions, in particular lithium ions, can be stored; (iii) a second electrode with a second current conductor, which has a second electrically conductive material that is impermeable to ions during operation of the energy storage cell; (iv) wherein the second current conductor has two opposite sides, each coated with a second active material in which the ions can be stored; (v) a separator arranged between the first electrode and the second electrode, whereby the first electrode and the second electrode are electrically insulated from one another; (vi) wherein the first current conductor has a first region which is permeable to ions so that the ions can pass from one to the other of the two opposite sides of the first current conductor.

The terms "comprises," "includes," "has," "includes," "has," "with," or any other variation thereof, as used herein, are intended to cover non-exclusive inclusion. For example, a method or apparatus that includes or has a list of elements is not necessarily limited to those elements, but may include other elements not expressly listed or that are inherent in such method or apparatus.

Furthermore, unless expressly stated to the contrary, "or" refers to an inclusive "or" and not an exclusive "or". For example, a condition A or B is satisfied by one of the following conditions: A is true (or exists) and B is false (or absent), A is false (or absent) and B is true (or exists), and both A and B are true (or exists).

As used herein, the terms "a" or "an" are defined to mean "one or more". The terms "another" and "another" and any other variation thereof are defined to mean "at least one other".

The term “plurality” as used here should be understood to mean “two or more”.

The term "configured" or "set up" to perform a specific function (and respective variations thereof) as used here is to be understood as meaning that the corresponding device is already in a design or setting in which it can perform the function or it is at least adjustable - i.e. configurable - so that it can perform the function after the corresponding setting. The configuration can be carried out, for example, by setting the parameters of a process sequence or switches or similar to activate or deactivate functionalities or settings. In particular, the device can have several predetermined configurations or operating modes, so that the configuration can be carried out by selecting one of these configurations or operating modes.

The term "electrode coil" as used here refers in particular to a device which, as an assembly of a galvanic cell, in particular a battery cell, also serves to store chemical energy and release electrical energy. For this purpose, the electrode coil has at least two electrodes, namely an anode and a cathode, and a separator, in particular an electrically insulating separator, which can at least partially accommodate an electrolyte. The anode, separator and cathode are wound around an axis to form an electrode coil. The separator is arranged between the anode and the cathode so that the anode and cathode are electrically insulated from one another. This creates a repeating sequence of separator-anode-separator-cathode in the electrode coil. Before electrical energy is released, stored chemical energy is converted into electrical energy. While the cell is charging, the electrical energy supplied to the electrode coil is converted into chemical energy and stored. The electrodes can have a current conductor, in particular made of Al for the cathode and of Cu for the anode, wherein a thin layer made of a mixture of an active material, binder (e.g. PVDF, PTFE, CMC, SBR, Li-PAA, PAA, etc.) and conductive additives (carbon black, CNTs, carbon fibers, etc.) can be applied to both sides of the current conductor. The current conductor can in particular be designed as a film.

The term "active material" as used here refers in particular to a material that can be electrochemically active and that is suitable for coating electrodes for electrode windings for battery cells and in which ions, in particular lithium ions, can be stored. The active material for the cathode can in particular comprise NMC, NCA, NCMA, LCO, LFP, LMFP, LMO, LNMO or another material. The active material for the anode can in particular comprise graphite, SiOx, SiC, Si, Sn, SnOx or another material.

The term "separator layer" or a "separator" as used here is to be understood in particular as an electrically insulating device which separates and spaced apart an anode from a cathode. Preferably, a separator layer is applied to an anode layer and/or a cathode layer. Preferably, the separator layer is designed as an independent body. The separator layer or the separator can also at least partially accommodate an electrolyte, wherein the electrolyte preferably contains lithium ions. The electrolyte can also be electrochemically connected to adjacent layers of an electrode stack or electrode coil. Preferably, the shape of a separator essentially corresponds to the shape of an anode of the electrode stack. Preferably, a separator is designed to be thin-walled, particularly preferably as a microporous film. Preferably, the separator layer or the separator is wetted with an additive which also increases the mobility of the separator layer or the separator. The separator can also have a ceramic coating, in particular a base film made of polyethylene and coated on one or both sides with, for example, Al ₂ O ₃ , as well as a so-called binder. Wetting is particularly preferably carried out with an ionic additive. The separator layer or separator preferably extends at least in some areas over a boundary edge of at least one electrode. The separator layer or separator particularly preferably extends beyond all boundary edges of adjacent electrodes.

The term "electrolyte" as used here refers to a liquid or solid material through which ions can be conducted, thereby enabling current to be transported between the electrodes of a battery, in particular between a cathode and an anode. Unlike electronic conductivity (through electrons) in the electrode materials, the electrolyte must be ionically conductive, i.e. conduct the electrical current by transporting charged atoms or molecules (ions). The electrolyte is advantageously chemically stable against decomposition in a wide temperature window and electrochemically stable in the largest possible voltage window. Ideally, it is non-toxic and non-flammable and has at least a high flash point and low heat of combustion. Liquid systems may be preferred over polymer and solid electrolytes due to their better conductivity.

The electrode winding according to the first aspect makes it possible for ions to pass from one side to the other side of the opposite sides of the first current conductor through the permeable first region during operation of the energy storage cell using an electrolyte. This can compensate for an unequal existing capacitance of the opposite sides to one another, caused by an unequal area of a surface arranged radially further inwards in relation to the longitudinal axis compared to a surface arranged radially further outwards.

Preferred embodiments of the electrode winding are described below, which can be combined with each other and with the other aspects described as desired, unless this is expressly excluded or is technically impossible.

In some embodiments, the first region is formed at a first end region of the first current conductor, radially adjacent to the longitudinal axis. This can increase the effect of the compensation, since the ratio of the areas in the first end region is larger than in areas arranged radially further outwards.

In some embodiments, the first end region has a first edge region for electrical contacting, which is designed to be impermeable to ions. As a result, the first edge region has additional material compared to a permeable region and can therefore be better connected electrically to another component, in particular by welding.

In some embodiments, the first end region has a first edge region for electrical contacting, which is designed to be permeable to ions. This allows the first end region to be manufactured uniformly throughout.

In some embodiments, the first region has recesses, in particular recesses with a circular or square cross-section. This makes it possible for the ions to pass through the first current conductor.

In some embodiments, the second current conductor has a second region that is permeable to ions, so that the ions can pass from one of the two opposite sides of the second current conductor to the other. This makes it possible for ions to pass from one side of the opposite sides of the second current conductor to the other through the permeable first region during operation of the energy storage cell using an electrolyte. This makes it possible to compensate for an unequal existing capacitance of the opposite sides to one another, caused by an unequal area of a surface arranged radially further inwards with respect to the longitudinal axis to a surface arranged radially further outwards. Furthermore, this creates an ion-permeable region in both the first current conductor and the second current conductor, as a result of which the capacitances between the electrodes can be better balanced.

In some embodiments, the second region is formed at a second end region of the second current conductor, radially adjacent to the longitudinal axis. This can increase the effect of the compensation, since the ratio of the areas in the second end region is larger than in areas arranged radially further outwards.

In some embodiments, the second end region has a second edge region for electrical contacting, which is designed to be impermeable to ions. As a result, the second edge region has additional material compared to a permeable region and can therefore be better connected electrically to another component, in particular by welding.

In some embodiments, the second end region has a second edge region for electrical contacting, which is designed to be permeable to ions. This allows the second end region to be manufactured uniformly throughout.

In some embodiments, the second region has recesses, in particular recesses with a circular or square cross-section. This can achieve that the ions can pass through the second current conductor.

A second aspect of the solution relates to an energy storage cell, in particular a lithium-ion battery cell, comprising a cylindrical cell housing in which an electrode coil according to the first aspect is arranged.

A third aspect of the solution concerns a battery unit with several energy storage cells according to the second aspect.

A fourth aspect of the solution relates to a system with an electric drive and a battery unit according to the third aspect. In particular, the system can comprise a motor vehicle, a mobile device or also a stationary device, such as a charging storage unit in a building.

A fifth aspect of the solution relates to a method for producing an electrode coil for an energy storage cell, with the following steps: (i) producing a first electrode comprising the step of coating opposite sides of a first current conductor with a first active material in which ions can be stored, wherein the first current conductor has a first electrically conductive material that is impermeable to ions during operation of the energy storage cell and wherein the first current conductor has a first region that is permeable to ions so that the ions can pass from one to the other of the two opposite sides of the first current conductor; (ii) producing a second electrode comprising the step of coating opposite sides of a second current conductor with a second active material in which the ions can be stored, wherein the second current conductor (165) has a second electrically conductive material that is impermeable to ions during operation of the energy storage cell (100); (iii) arranging a separator, the first electrode and the second electrode in a sequence separator, first electrode, separator, second electrode; (iv) winding this arrangement about a longitudinal axis.

In some embodiments, the first current collector is separated from a current collector roll provided for a plurality of current collectors for a plurality of electrode coils in a manufacturing step prior to coating, the current collector roll having a first region permeable to the ions at equal intervals. As a result, a plurality of current collectors with a first region each permeable to ions can be manufactured more effectively.

The features and advantages explained with regard to the first aspect of the solution also apply to the other aspects described.

Further advantages, features and possible applications emerge from the following description of preferred embodiments in connection with the figures.

• 1 schematisch eine Batteriezelle gemäß einer Ausführungsform;
• 2A bis 2B schematisch jeweils einen Ausschnitt einer beschichteten ersten Elektrode einer Ausführungsform;
• 2C bis 2D schematisch jeweils einen Ausschnitt einer beschichteten zweiten Elektrode einer Ausführungsform
• 3 ein Flussdiagramm zur Veranschaulichung einer bevorzugten Ausführungsform eines Verfahrens.

This shows

• 1 schematically shows a battery cell according to an embodiment;
• 2A to 2B schematically shows a section of a coated first electrode of an embodiment;
• 2C to 2D schematically a section of a coated second electrode of an embodiment
• 3 a flow chart illustrating a preferred embodiment of a method.

Throughout the figures, the same reference numerals are used for the same or corresponding elements.

In 1 a battery cell 100 according to an embodiment is shown schematically. The battery cell 100 has an electrically conductive cell housing 110. An electrode coil 120 is arranged in the cell housing 110. The electrode coil 120 has an electrode with a first, positive, polarity 140 and an electrode with a second, negative, polarity 160. The electrode coil 120 and the battery cell 100 could also be constructed such that the first polarity is negative and the second polarity is positive. The electrode coil 120 is arranged in the cell housing 110 such that electrodes with positive polarity 140 and negative polarity 160 are arranged alternately in the radial direction to a longitudinal axis L of the cell housing 110 or the electrode coil 120. A separator 130 is arranged between the positively polarized electrode 140 and the negatively polarized electrode 160, which has an electrically insulating material so that the differently polarized electrodes 140, 160 are electrically insulated from one another. The positively polarized electrode 140 has a first current conductor 145, which is coated on both sides with a first electrochemical active material 150. The negatively polarized electrode 160 has a second current conductor 165, which is coated on both sides with a second electrochemical active material 170. The first current conductor 145 and the second current conductor 165 can each be designed as a film. In this context, a current conductor designed as a film is also referred to below as a conductor film. The electrode winding 120 is arranged within the cell housing 110 in such a way that that the negative electrode 160 is electrically connected to the cell housing 110.

It is also conceivable that the electrode coil 120 is arranged within the cell housing 110 in an electrically insulating inner housing (not shown here), which electrically insulates the electrode coil 120 from the cell housing 110.

The positively polarized electrode 140 is electrically connected to a first metal plate 180. The negatively polarized electrode 160 is electrically connected to a second metal plate 190.

In 1 The battery cell 100 schematically has an electrode winding 120 with only two turns. However, the electrode winding 120 can also have significantly more turns, in particular between 20 and 100 turns.

Due to the geometry of the electrode winding 120, in which the electrodes of negative and positive polarity 140, 160 are wound spirally around a longitudinal axis L, an unfavorable ratio of the electrochemical active material 145 and the ions stored therein between the electrode of positive polarity 140 and the electrode of negative polarity 160 can arise. This is due to the fact that a surface of the first conductor foil 145 that is located radially further outward in relation to the longitudinal axis L has a larger surface than another surface that is located inward, whereby different capacitances can be formed on the respective surfaces.

The first conductor foil 145 has, in an innermost turn with respect to the longitudinal axis L, a first region 230 which is perforated and is thus permeable to ions. This allows the ratio of the stored ions between two opposite sides of the first conductor foil 145 to be adjusted. Embodiments of sections of the first conductor foil 145 and the first region 230 are described below in the 2A to 2B described in more detail. The second conductor foil 165 has, in a turn that is innermost with respect to the longitudinal axis L, a second region 260 that is perforated and is thus permeable to ions. This allows the ratio of the stored ions between two opposite sides of the second conductor foil 165 to be adjusted. Embodiments of sections of the second conductor foil 165 and the second region 260 are described below in the 2C to 2D described in more detail.

In the 2A to 2B Embodiments of a section of a first electrode 140 with positive polarity are shown.

In 2A is a schematic section 200 of a first electrode of positive polarity 140 of the electrode coil 120 from 1 a first embodiment is shown. The first electrode 140 has a first conductor foil 145 made of an electrically conductive material, in particular aluminum. The first conductor foil 145 is coated on both sides with a first electrochemical active material 150, in which ions, in particular lithium ions, can be stored during operation of the battery cell. A first edge region 235 protruding towards the coated regions is formed at an end region of the first conductor foil 145. An electrical connection, in particular by welding, can be made at this first edge region 235 to a first metal plate 180, via which an electrical contact can be made through a cell housing wall with an electrical consumer. In this exemplary embodiment, the first edge region 235 has no perforation and is impermeable to ions.

The first conductor foil 145 has a first region 230 that is permeable to the ions. In particular, the first region 230 has a hole structure or a perforation that is designed such that ions can pass from one side of the first conductor foil 145 through the hole structure to the other side of the first conductor foil 145. This allows the ratio of the stored ions between two opposite sides of the first conductor foil 145 to be adjusted in the installed state.

In 2 B A section 210 of a coated first electrode with positive polarity 140 of a second embodiment is shown schematically. The first conductor foil 145 has, as in 2A , a first region 230 with a hole structure. The perforated first region 230 extends beyond the coated region, so that the first edge region 235 of the first conductor foil 145 is also perforated. This allows the electrical connection of the first metal plate 180 to a perforated edge region 235.

In the 2C to 2D Embodiments of a section of a second electrode 160 with negative polarity are shown.

In 2C is a schematic section 240 of a second electrode of negative polarity 160 of the electrode coil 120 of 1 a first embodiment is shown. The second electrode 160 has a second conductor foil 165 made of an electrically conductive material, in particular copper. The second conductor foil 165 is coated on both sides with a second electrochemical active material 170, in which ions, in particular lithium ions, can be stored during operation of the battery cell. At an end region of the second conductor foil 165, a second edge region 265 protruding towards the coated regions is formed. At this second edge region 265, an electrical connection can be made, in particular by welding, to a second metal plate 190, via which an electrical contact can be made through a cell housing wall with an electrical consumer. In this exemplary embodiment, the second edge region 265 has no perforation and is impermeable to ions.

The second conductor foil 165 has a second region 260 that is permeable to the ions. In particular, the second region 260 has a hole structure or a perforation that is designed such that ions can pass from one side of the second conductor foil 165 through the hole structure to the other side of the second conductor foil 165. This allows the ratio of the stored ions between two opposite sides of the second conductor foil 165 to be adjusted in the installed state.

In 2D A section 250 of a coated second electrode with negative polarity 160 of a second embodiment is shown schematically. The second conductor foil 165 has, as in 2C , a second region 260 with a hole structure. The perforated second region 260 extends beyond the coated region, so that the second edge region 265 of the second conductor foil 165 is also perforated. This allows the electrical connection of the second metal plate 190 to a perforated edge region 265.

The first region 230 and/or second region 260 permeable to ions can be formed on one or more radially inner or innermost turns of the corresponding first conductor foil 145 or the second conductor foil with respect to the longitudinal axis L. Likewise, the first region 230 and/or second region 260 can be formed on turns that are arranged radially further away from the longitudinal axis L.

A perforated foil or expanded metal can be used as a discharge foil to reduce mechanical stresses in a winding core that arise as a result of the expansion/contraction of the active material during charge/discharge cycles.

In 3 A flow chart is shown to illustrate a preferred embodiment of a method for producing an electrode coil 120.

In a first step 310 of the method, a first electrode 140 is manufactured, comprising the step of coating opposite sides of a first current conductor 145 with a first active material 150 in which ions can be stored, wherein the first current conductor 145 has a first electrically conductive material that is impermeable to ions during operation of the energy storage cell 100 and wherein the first current conductor has a first region 230 that is permeable to ions so that the ions can pass from one to the other of the two opposite sides of the first current conductor 145.

In a further step 320 of the method, a second electrode 165 is manufactured, comprising the step of coating opposite sides of a second current conductor 165 with a second active material 170 into which the ions can be stored, wherein the second current conductor 165 has a second electrically conductive material that is impermeable to ions during operation of the energy storage cell 100.

In a further step 330 of the method, a separator 130, the first electrode 140 and the second electrode 160 are arranged in a sequence separator 130, first electrode 140, separator 130, second electrode 160.

In a further step 340 of the method, this arrangement is wound around a longitudinal axis L.

When producing the first conductor foil 145 and/or the second conductor foil 165 as a roll, for example with about 1000 m per roll, it is advantageous if the distance between the perforated areas is selected so that the roll can be cut to fit several planned electrode windings 120. The length of the perforated area in the rolling direction is based on how many turns are to be in the area of the perforated foil.

While at least one exemplary embodiment has been described above, it should be noted that a wide variety of variations exist thereon. It should also be noted that the exemplary embodiments described are merely non-limiting examples and are not intended to limit the scope, applicability, or configuration of the devices and methods described herein. Rather, the foregoing description will provide one skilled in the art with guidance for implementing at least one exemplary embodiment, it being understood that various changes in the operation and arrangement of the elements described in an exemplary embodiment may be made. without departing from the subject matter as defined in the appended claims and its legal equivalents.

LIST OF REFERENCE SYMBOLS

100

Battery cell

110

Cell housing

120

Electrode winding

130

separator

140, 160

First and second electrode

145, 165

First and second current conductor

150, 170

First and second active material

180, 190

First and second metal plate

200, 210

Sections of a first electrode of each embodiment

240, 250

Sections of a second electrode of each embodiment

230, 260

First and second area

235, 265

First and second edge area

300

Flowchart illustrating a preferred embodiment of a method

310

Processing a first electrode

320

Processing a second electrode

330

Placing a separator between the electrodes

340

Winding the electrodes and separator around a longitudinal axis

Claims (15)

Electrode coil (120) for an energy storage cell (100), comprising: A first electrode (140) with a first current conductor (145) which has a first electrically conductive material that is impermeable to ions during operation of the energy storage cell; wherein the first current conductor (145) has two opposite sides, which are each coated with a first active material (150) in which ions can be stored; a second electrode (160) with a second current conductor (165) which has a second electrically conductive material that is impermeable to ions during operation of the energy storage cell; wherein the second current conductor (165) has two opposite sides, each coated with a second active material (170) in which the ions can be stored; a separator (130) arranged between the first electrode (140) and the second electrode (160), whereby the first electrode (140) and the second electrode (160) are electrically insulated from each other; wherein the first current conductor (145) has a first region (230) which is permeable to the ions so that the ions can pass from one to the other of the two opposite sides of the first current conductor (145). Electrode winding (120) after Claim 1 , wherein the first region (230) is formed at a first end region of the first current conductor (145), radially adjacent to the longitudinal axis (L). Electrode winding (120) after Claim 2 , wherein the first end region has a first edge region (235) for electrical contacting, which is impermeable to ions. Electrode winding (120) after Claim 2 , wherein the first end region has a first edge region (235) for electrical contacting, which is permeable to ions. Electrode coil (120) according to one of the preceding claims, wherein the first region (230) has recesses. Electrode coil (120) according to one of the preceding claims, wherein the second current conductor (165) has a second region (260) which is designed to be permeable to ions so that the ions can pass from one to the other of the two opposite sides of the second current conductor (165). Electrode winding (120) after Claim 6 , wherein the second region (260) is formed at a second end region of the second current conductor (165), radially adjacent to the longitudinal axis (L). Electrode winding (120) after Claim 7 , wherein the second end region has a second edge region (265) for electrical contacting, which is impermeable to ions. Electrode winding (120) after Claim 7 , wherein the second end region has a second edge region (265) for electrical contacting, which is permeable to ions. Electrode winding (120) according to one of the previous Claims 6 until 9 , wherein the second region (260) has recesses. Energy storage cell (100), comprising a cylindrical cell housing (110) in which an electrode coil (120) according to one of the preceding claims is arranged. Battery unit with several energy storage cells (100) according to Claim 11 . System with an electric drive and a battery unit according to Claim 12 . Method for producing an electrode coil (120) for an energy storage cell (100), with the following steps: Manufacture of a first electrode (140) comprising the step of coating opposite sides of a first current conductor (145) with a first active material (150) in which ions can be stored, wherein the first current conductor (145) has a first electrically conductive material that is impermeable to ions during operation of the energy storage cell (100) and wherein the first current conductor has a first region (230) that is permeable to ions so that the ions can pass from one to the other of the two opposite sides of the first current conductor (145); Manufacturing a second electrode (165) comprising the step of coating opposite sides of a second current conductor (165) with a second active material (170) in which the ions can be stored, wherein the second current conductor (165) comprises a second electrically conductive material that is impermeable to ions during operation of the energy storage cell (100); Arranging a separator (130), the first electrode (140) and the second electrode (160) in a sequence separator (130), first electrode (140), separator (130), second electrode (160); Winding this arrangement around a longitudinal axis (L). Procedure according to Claim 14 , wherein the first current conductor (145) is separated in a manufacturing step before coating from a current conductor roll which is provided for a plurality of current conductors (145) for a plurality of electrode coils (120), wherein the current conductor roll has a first region (230) at equal intervals which is permeable to the ions.

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